<TITLE>prob015: Schur's lemma</TITLE>
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<H1>prob015: Schur's lemma</H1>

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<TR> <TD> proposed by
     <TD ALIGN=LEFT> <A HREF="http://www.cs.york.ac.uk/~tw">
          <B>Toby Walsh</B></A> 
          <ADDRESS><a href="mailto:tw@cs.york.ac.uk">
          tw@cs.york.ac.uk</a></ADDRESS>
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<H3> Results </H3>

For 3 boxes, the problem has a solution for 13 or less balls.
It is insoluble for 14 or more balls.
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